The rate is independent of the concentration of the reactants ina)First orderb)Second orderc)Third orderd)Zero orderCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

Bcz rate is proportional to the zeroth power  of the concentration of reactant.

Answer

In some reactions, the rate is apparently independent of the reactant concentration. The rates of these zero-order reactions do not vary with increasing nor decreasing reactants concentrations. This means that the rate of the reaction is equal to the rate constant, $k$, of that reaction.

Answer

First Order Reaction:
In a first order reaction, the rate of the reaction is proportional to the concentration of one reactant raised to the power of 1. Mathematically, the rate equation for a first order reaction can be represented as:

Rate = k[A]

where [A] represents the concentration of reactant A and k is the rate constant.

Second Order Reaction:
In a second order reaction, the rate of the reaction is proportional to the concentration of one reactant raised to the power of 2. Mathematically, the rate equation for a second order reaction can be represented as:

Rate = k[A]^2

where [A] represents the concentration of reactant A and k is the rate constant.

Third Order Reaction:
In a third order reaction, the rate of the reaction is proportional to the concentration of one reactant raised to the power of 3. Mathematically, the rate equation for a third order reaction can be represented as:

Rate = k[A]^3

where [A] represents the concentration of reactant A and k is the rate constant.

Zero Order Reaction:
In a zero order reaction, the rate of the reaction is independent of the concentration of the reactants. Mathematically, the rate equation for a zero order reaction can be represented as:

Rate = k

where k is the rate constant.

Explanation:
In a zero order reaction, the rate of the reaction remains constant regardless of the concentration of the reactants. This means that doubling or halving the concentration of the reactants will not affect the rate of the reaction. The rate constant (k) is the only factor that determines the rate of the reaction.

This can be explained by considering the reaction mechanism. In a zero order reaction, the rate-determining step does not involve the reactants. Instead, it is determined by the concentration of some other species or the surface area of the catalyst. Therefore, changing the concentration of the reactants does not affect the rate of the reaction.

Practical Examples:
Some examples of zero order reactions include the decomposition of ozone (O3) and the oxidation of ethanol by potassium dichromate in acidic medium. In both cases, the rate of the reaction is independent of the concentration of the reactants.

Overall, the rate of a reaction is independent of the concentration of the reactants in a zero order reaction.

Similar Class 12 Doubts

Which one is not correct ?

A reaction whose order is different from the actual due to large excess concentration of one of the reactants is called?

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